Adds the missing migration for the tool_feedback table (dobetternorge_maindb)
that the in-result feedback widget writes to, repoints api/feedback.php to
dbnmDb() for consistency with the engine-config table, and adds an owner-only
dashboard (page + read API + nav) summarising ratings and notes by tool/engine.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
